Insurance covers cash value on properties built prior to 1940

[Jinglei Shen]

I am looking to purchase this investment duplex property which was built prior to 1940. All state said they cover cash value for properties built prior to 1940, drewlling comes out less than half of asking price. The insurance quote is $1476/year, deductible $2500, 300k liability. The agent said this is likely a market standard. Anyone who had a agent referral that deals with this type of old property can get me a better quote.